修改ASP.NET核心2.0中所请求文件的内容

Question

我正在尝试使用下面的代码更改指定的请求文件的正文。 index.html文件被正确发送到客户端，但head部分中包含的其他文件在客户端是空的（文件显示在chrome中的sources选项卡中）。红隼不报告任何错误。你能解释一下为什么吗？

public static Func<HttpContext, Func<Task>, Task> Rewrite()
{
    return async (context, next) =>
    {
        if (context.Request.Path.Value == "/")
        {
            var originalStream = context.Response.Body;

            using (Stream bufferStream = new FileStream("./wwwroot/index.html", FileMode.Open, FileAccess.Read))
            {
                context.Response.Body = bufferStream;
                bufferStream.Seek(0, SeekOrigin.Begin);

                using (var reader = new StreamReader(bufferStream))
                {
                    var response = await reader.ReadToEndAsync();
                    response = response.Replace("[ddd]", "<script type=\"text/javascript\" src=\"lib/jquery/dist/jquery.js\"></script>");

                    using (var writer = new StreamWriter(originalStream))
                    {
                        await writer.WriteAsync(response);
                    }
                }
            }
        }
        else
        {
            await next();
        }
    };
}

当然，此功能已在配置文件中注册

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.Use(ResponseStreamRewriter.Rewrite());
}